GoKawiilPaul Jones / Android Authority
TL;DR Samsung has released the fourth One UI 9 beta for the Galaxy S26 series.
The 1,250MB update (firmware ZZG4) includes the July 5, 2026, security patch and fixes key issues, including abnormal lock screen clock sizes, missing navigation bars during gaming, cut-off timer notifications, and broken routine actions.
Currently live in Germany, India, Poland, the UK, and South Korea, the new update will soon be available in the US as well.
Samsung is moving swiftly through its software development cycle, officially releasing the fourth beta of its One UI 9 skin for the Galaxy S26 series. Following the rollout of One UI 9 beta 3 last month, the new beta released today focuses squarely on optimizing performance, smoothing out the UI, and squashing persistent system bugs ahead of the final stable release later this year.
We’ve received the fourth One UI 9 update on our Galaxy S26 Ultra in the UK. This Android 17-based update comes with firmware version ending in ZZG4, the July 5, 2026 security patch, and is 1,250MB in size.
Aamir Siddiqui / Android Authority
The changelog doesn’t mention any major new features, but goes on to target several key bugs: Improved an issue where the clock size appears abnormal when rotating the lock screen horizontally/vertically
Improved an issue where it does not operate normally when turning ON/OFF via Quick Panel or Settings while the Privacy Display routine is running
Improved an issue where the navigation bar disappears under certain conditions during games
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